A function returning one or more space-separated class names to be removed. Receives the index position of the element in the set and the old class value as arguments.

If a class name is included as a parameter, then only that class will be removed from the set of matched elements. If no class names are specified in the parameter, all classes will be removed.

Before jQuery version 1.12/2.2, the .removeClass() method manipulated the classNameproperty of the selected elements, not the classattribute. Once the property was changed, it was the browser that updated the attribute accordingly. This means that when the class attribute was updated and the last class name was removed, the browser might have set the attribute's value to an empty string instead of removing the attribute completely. An implication of this behavior was that this method only worked for documents with HTML DOM semantics (e.g., not pure XML documents).

As of jQuery 1.12/2.2, this behavior is changed to improve the support for XML documents, including SVG. Starting from this version, the classattribute is used instead. So, .removeClass() can be used on XML or SVG documents.

More than one class may be removed at a time, separated by a space, from the set of matched elements, like so:

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$( "p" ).removeClass( "myClass yourClass" )

This method is often used with .addClass() to switch elements' classes from one to another, like so:

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$( "p" ).removeClass( "myClass noClass" ).addClass( "yourClass" );

Here, the myClass and noClass classes are removed from all paragraphs, while yourClass is added.

To replace all existing classes with another class, we can use .attr( "class", "newClass" ) instead.

As of jQuery 1.4, the .removeClass() method allows us to indicate the class to be removed by passing in a function.

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$( "li:last" ).removeClass(function() {

return $( this ).prev().attr( "class" );

});

This example removes the class name of the penultimate <li> from the last <li>.